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Make K ->> V an opaque type of V #42

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Merged
mrdziuban merged 2 commits into from
Feb 10, 2026
Merged

Make K ->> V an opaque type of V #42

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8930eb3
Add `HList.Head` and `HList.Tail` match types.
mrdziuban Feb 10, 2026
7e01dc1
Make `K ->> V` an opaque type of `V`, stop using `TranslucentTagged`.
mrdziuban Feb 10, 2026
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3 changes: 3 additions & 0 deletions core/shared/src/main/scala-3/formless/hlist/HList.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,9 @@ object HList {

def fromArray[A](a: Array[A]): HList = a.foldRight(HNil: HList)(_ :: _)

type Head[H <: HList] = H match { case h :: _ => h }
type Tail[H <: HList] = H match { case _ :: t => t }

type FromTuple[T <: Tuple] <: HList = T match {
case EmptyTuple => HNil
case h *: t => h :: FromTuple[t]
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16 changes: 10 additions & 6 deletions core/shared/src/main/scala-3/formless/record/RecordPackageCompat.scala
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Expand Up @@ -5,16 +5,20 @@ import formless.hlist.HList
import scala.language.implicitConversions

trait RecordPackageCompat {
final opaque type ->>[K, +V] = tagged.TranslucentTagged[V, K]
object ->> {
implicit def convertToV[K, V](kv: K ->> V): V = kv
final opaque type ->>[K, +V] = V
sealed trait `->>LP` {
@deprecated("Use inlineConvertToV", "0.8.0")
private[record] implicit def convertToV[K, V](kv: K ->> V): V = kv
}
object ->> extends `->>LP` {
inline implicit def inlineConvertToV[K, V](kv: K ->> V): V = kv
}

@inline final def field[K]: [V] => V => (K ->> V) = [v] => (v: v) => tagged.translucentTag[K](v)
@inline final def label[K]: [V] => V => (K ->> V) = [v] => (v: v) => tagged.translucentTag[K](v)
@inline final def field[K]: [V] => V => (K ->> V) = [v] => (v: v) => v
@inline final def label[K]: [V] => V => (K ->> V) = [v] => (v: v) => v

extension[K <: Singleton](k: K) {
inline final def ->>[V](v: V): K ->> V = tagged.translucentTag[K](v)
inline final def ->>[V](v: V): K ->> V = v
}

extension[K, V](kv: K ->> V) {
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